I'm wanting to use the 3 kinematics equations but I feel like i'm missing information. I know what the answer is already but I want to understand how to get it. It seems I can't simply use the equations for 1D kinematics so if anyone can show me i'd be much obliged.

I'm wanting to use the 3 kinematics equations but I feel like i'm missing information. I know what the answer is already but I want to understand how to get it. It seems I can't simply use the equations for 1D kinematics so if anyone can show me i'd be much obliged.

Split the problem into two parts! Part 1 and part 2!

In part 1, the bolt is being accelerated from rest for 4 seconds.

We don't know what value of the acceleration, that's what we're trying to find! But we do know one thing about it, it's negative, since the rocket flies upwards.

Now let's have a look at part 2. In part 2 the bolt has a negative velocity , and it accelerates towards the ground with . And it then hits the ground and has velocity 0, and this process takes 6.6 seconds!